Name ______________________________________________ 35 Title: What are the parts of the human cheek cell? Purpose: To observe cheek cell structures and describe their functions. To compare plant and animal cells. Materials: microscope, slide, cover slip, Lugol’s Solution, tongue depressor, cheek cells Procedure: Preparing a wet mount slide. 1.
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Put a drop of water in the center of your slide. GENTLY scrape the inside of your cheek with the tongue depressor. Smear the water with the tongue depressor to transfer the cells onto the slide. Add a drop of stain to the slide Add a cover slip and observe the slide under both low and high power. Draw the cells under low and high power. Label the following structures: cell membrane, nucleus and cytoplasm. Estimating the size of the onion cell. 1. Use the metric ruler to measure the size of view under low power. ___________mm
Using the slide of the cheek cells:
2. How many cells fit across the diameter of the field of view? ________________
3. What do you estimate the size of each onion cell to be? _____________________
In the DATA section of your lab report, answer the following questions: a.
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What color are the cells? Can you see the cells clearly? Can you see a dark outline around the cells? How does the outer border compare with the plant cell? Is the border a single or double layer? Why was the stain added to the cells? What is the dark structure inside the cell? What cell parts did you find in both plant and animal cells?